With my graphics card on Windows 8.1 x64 and all newer driver versions (tested from 332.21 to 344.80) my pcie bus interface gets set to 2.0 (even under load). With 327.23 it is as it should be at 3.0. My motherboard is a Gigabyte Sniper 3 which supports PCIE 3.0 . Can someone test this? I am also having a huge latency problem (DPC/ISR).